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I can't say for sure. But what you're limiting is the actual file transfer. I'd guess that Transmission would still update the trackers at a regular interval. That shouldn't be too much data, but if you have many active torrents, it'll grow. Perhaps it keeps updating the list of peers as well.

No, I meant Transmission. Connections require bandwidth, even if you're not transferring actual data. I don't know if Transmission will disconnect when you set a limit of 0 or if it will still keep the connections open. In other words; there can be many reasons why it still uses bandwidth.
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Jo-Erlend SchinstadSep 6 '13 at 3:19